Table 1. Demographic characteristics, number of cases, symptoms and indicators of severity of disease among respondents following the 2010 and 2011 triathlon competitions, Copenhagen, Denmark.
|
2010 competition (n=838) |
2011 competition (n=931) |
|||||
|---|---|---|---|---|---|---|
| Category | Number (%) | Median duration (days) | Number (%) | Median duration (days) | p-value | |
| Demographics | ||||||
| Age, < 38 years | 395 (47.1) | NA | 545 (58.5) | NA | <0.001 | |
| Female sex | 112 (13.4) | NA | 126 (13.5) | NA | NS | |
| Danish nationality | 600 (71.6) | NA | 750 (80.9) | NA | <0.001 | |
| Cases | ||||||
| Cases1 | 351 (42) | NA | 78 (8) | NA | <0.001 | |
| Secondary case definition, cases2 | 136 (16) | NA | 34 (4) | NA | <0.001 | |
| Individual symptoms | ||||||
| Diarrhoea | 323 (39) | 5 | 60 (6) | 2 | <0.001 | |
| Vomiting | 115 (14) | 1 | 27 (3) | 1 | <0.001 | |
| Stomach cramps | 245 (29) | 3 | 66 (7) | 1 | <0.001 | |
| Fever | 142 (17) | 2 | 79 (8) | 1 | <0.001 | |
| Nausea | 207 (25) | 2 | 139 (15) | 1 | <0.001 | |
| Bloody diarrhoea | 9 (1) | 3 | 5 (0.5) | 2 | NS | |
| Headache | 124 (15) | 2 | 80 (9) | 1 | <0.001 | |
| Tenesmus | 162 (19) | 4 | 33 (4) | 2 | <0.001 | |
| Muscle pain | 213 (25) | 3 | 468 (50) | 3 | <0.001 | |
| Severity of disease | ||||||
| Visit physician | 116 (14) | NA | 33 (4) | NA | <0.001 | |
| Absence from work | 220 (26) | NA | 27 (3) | NA | <0.001 | |
| Faeces sample submitted | 48 (6) | NA | 3 (0.3) | NA | <0.001 | |
| Cases reporting exhaustion | 44 (13) | NA | 41 (53) | NA | <0.001 | |
p-values assessed by X2 test except for age where the Student t-test was used. NS = Not significant; NA = Not applicable
1Participants suffering from diarrhoea and/or vomiting.
2Participants suffering from diarrhoea and at least two of the following symptoms: vomiting, stomach cramps, fever, nausea, dizziness or headache.